Refactor log flag to new structure

[josedonizetti]

Changes:

• New flag format: Changed from --log level:debug to --log level=debug
• Structured filters: Changed from --log filter:msg=error to --log filter.include.msg=error
• Level field rename: Changed level: to lvl: in config for consistency
• Consistent syntax: All log options now use dot notation for hierarchy and equals for values
• Added constants: Defined all log flag constants for maintainability
• Updated parsing: Refactored PrepareLogger to handle new structured format
• Fixed bugs: Resolved issues with multiple filter options not being applied correctly

Examples:

Old flag format (deprecated):

--log level:debug
--log file:/tmp/tracee.log  
--log aggregate:5s
--log filter:msg=error,pkg=core
--log filter-out:lvl=debug

New flag format:

--log level=debug
--log file=/tmp/tracee.log
--log aggregate.enabled=true --log aggregate.flush-interval=5s
--log filters.include.msg=error --log filters.include.pkg=core
--log filters.exclude.lvl=debug

Old config format (deprecated):

log:
  level: debug
  file: /tmp/tracee.log
  filters:
    msg: [foo, bar]
    level: [error]
  filter-out:
    level: [debug]

New config format:

log:
  level: debug
  file: /tmp/tracee.log
  filters:
    include:
      msg:
        - foo
        - bar
      lvl:
        - error
    exclude:
      lvl:
        - debug

Testing: All existing tests updated + comprehensive test coverage for new format.

[codecov]

Codecov Report

❌ Patch coverage is 57.30337% with 76 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@0b8ac82). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pkg/cmd/flags/logger.go	53.28%	58 Missing and 13 partials ⚠️
cmd/tracee/cmd/root.go	0.00%	3 Missing ⚠️
cmd/tracee/cmd/analyze.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4999   +/-   ##
=======================================
  Coverage        ?   29.37%           
=======================================
  Files           ?      234           
  Lines           ?    26184           
  Branches        ?        0           
=======================================
  Hits            ?     7691           
  Misses          ?    17954           
  Partials        ?      539           

Flag	Coverage Δ
unit	29.37% <57.30%> (?)

Files with missing lines	Coverage Δ
cmd/tracee-ebpf/main.go	0.00% <ø> (ø)
pkg/cmd/cobra/config.go	89.25% <100.00%> (ø)
cmd/tracee/cmd/analyze.go	32.52% <66.66%> (ø)
cmd/tracee/cmd/root.go	0.00% <0.00%> (ø)
pkg/cmd/flags/logger.go	55.36% <53.28%> (ø)

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